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Pakistan Oilfield Limited Jhandial-1 report on Pakistan Television

Success Stories

Through Tubing Inflatable BP For Water Shutoff Leads to 43% Production Increase and 80% WC Reduction

The candidate well was a development well located in Khyber Pakhtunkhawa Province of Pakistan. It was completed as commingled gas condensate producer from Limestone (overlying) and Sandstone (underlying) formations.

Well was brought online in 2010 and in 2013, PLT survey revealed 90% WC production from lower formations.

Initial attempts were made to set the blanking plug in nipple profile with slickline however, due to damaged nipple profile the operation could not be completed.

Sprint recommend to set a TTIBP via CT in 7” Liner at 3,738 m, to isolate the water production from lower formation and to allow stimulating the upper Limestone formation with SRA-15 acid system.

Stimulating Multi-Zone Using Nitrified Alcoholic SRA-5 and SRA-15

The candidate well was a development well drilled in a Sindh oilfield in Pakistan. The well targeted three different gas producing zones each of these zones were separated by a packer and could be accessed through an SSD.

The well was completed with 5” tubing down to 2,588 m and with PBTD of 2,707 m.

The three producing zones were:

Zones Perf

interval (m)

WHFP (psi)

Zone -1

2315 - 2393.5

497

Zone - 2

2474 - 2567

579

Zone - 3

2588.5 - 2637

600

It was required to stimulate Zone-2 & Zone-3 and enhance its production by eliminating the formation damage.

A matrix stimulation treatment using nitrified alcoholic SRA-15 proved to effectively increase the production of tight limestone and sandstone formations in wells with higher water affinity.

An energized alcoholic SRA-15 treatment was used for stimulating two sandstone zones in the same well, resulting in unprecedented production enhancement with an increment of 3.7 folds in one zone and of 2.4 folds in the second, and total awarding production increment of 8.72 MMSCFD gas.

The candidate well was the second extended reach horizontal well in Pakistan. The well was drilled in Sindh province and has a horizontal departure to vertical depth ratio of more than 1.5.

The main target of the well was (SML) formation and it was drilled as an 8 1/2’’ hole and a 7’’ liner was run and set at the depth of 1,700m leaving an OH section of 243m below liner shoe. A combination of 4-1/2’’ and 5-1/2’’ old tubing (above SSSV) were installed.

Well was later stimulated using Sprint’s recommended SRA-15 and NDA-S systems and tested at 20 MMSCFD.

During production, communication was observed in tubing annulus above SSSV, this was later confirmed using sonic logs to be at depth between 31.5m to 33.5m from RTKB.

A “16 ft Tubing Patch” was installed above SSSV using a hydraulically set thru tubing straddle packers run on coiled tubing. The tubing patch successfully isolated the leak in the tubing and the job helped the production company to handle similar tubing damage without the need to pull the completion and loose well production.

Alcoholic SRA-15 Acid System Brings Back on Production Gas Well

The candidate well was a development well completed with 7” Tie-back production liner down to 1,820 m and a 4.5” Liner from 1,758 m to 2,212 m. The well was producing from a carbonate cemented Sandstone formation through a perforated Interval from 1,846 m down to 2,166.5 m. The total net perforation interval was 197.5 m.

Due to low reservoir pressure (less than 500 psi), work-over on well was performed using inhibited OBM System and Nitrogen kickoff (s) were performed to bring back well on production.

However, during well cleanout operation it was found that the bottom perforations were producing sand at a rate beyond surface separation facility capacity. Accordingly, it was decided to plug the bottom perforations using a bridge plug and to dump cement on top of it prior to performing a well stimulation job through Coiled Tubing.

The plug was set at 2,101m and cement was dumped on top up to the depth of 2,103 m. After the isolation of sand producing zone, the net perforated interval was reduced to +/-100m. And production reduced from 10 mmscf/day to merely 4.9 mmscf/day.

A Matrix Stimulation treatment using SPRINT’S nitrified Organic Solvent and Alcoholic SRA-15 acid system in the sandstone reservoir resulted in a 60 % increase in production.

Coiled Tubing Conveyed Perforations in Highly Deviated Well Increases Production by 80%

A 22 meters of coiled tubing conveyed hydraulically operated perforations performed over 4 runs helped overcoming the highly deviated well limitation and led to an 80% increase in production and an overall $850,000 operation saving to client.

When cementing production zones where partial to total losses are observed, it is important to keep a tight control of the hydrostatic column of cement to fall within the narrow margin between frac and pore pressures. Sprint ultra light-weight high compressive strength GasTIGHT slurry helped maintaining weak formation integrity, avoiding excessive losses and prevent gas encroachment while providing excellent zonal isolation.

A nitrified SRA-10 acid treatment, pumped through a high pressure rotating jetting tool (SpinCAT) and placed underbalance, provided a technical and economical solution to wellbore scale cleanout in a high temperature low pressure environment and contributes to an incremental production of over 3 mmscf/day.